package com.itheima.controller;

import com.itheima.domain.SysLog;
import com.itheima.service.SysLogService;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.User;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;
import java.util.Date;

@Component
@Aspect
public class LogAop {

	@Autowired
	private HttpServletRequest request;

	@Autowired
	private SysLogService sysLogService;

	private Date visitTime; //开始时间
	private Class executeClass; //访问的类
	private Method method;//访问的方法

	//前置通知  主要是获取开始时间，执行的类是哪一个，执行的是哪一个方法
	@Before("execution(* com.itheima.controller.*.*(..))")
	public void doBefore(JoinPoint jp) throws NoSuchMethodException {
		visitTime = new Date();//当前时间就是开始访问的时间
		executeClass = jp.getTarget().getClass(); //具体要访问的类
		String methodName = jp.getSignature().getName(); //获取访问的方法的名称
		Object[] args = jp.getArgs();//获取访问的方法的参数
		//获取具体执行的方法的Method对象
		if (args == null || args.length == 0 ) {
			method = executeClass.getMethod(methodName); //只能获取无参数的方法
		} else {
			Class[] classArgs = new Class[args.length];
			for (int i = 0; i < args.length; i++) {
					classArgs[i] = args[i].getClass();
			}
			executeClass.getMethod(methodName, classArgs);
		}
	}

	//后置通知
	@After("execution(* com.itheima.controller.*.*(..))")
	public void doAfter(JoinPoint jp) throws Exception {
		long time = new Date().getTime() - visitTime.getTime(); //获取访问的时长

		String url = "";
		//获取url
		if (executeClass != null && method != null && executeClass != LogAop.class && executeClass != SysLogController.class) {
			//1.获取类上的@RequestMapping("/orders")
			RequestMapping classAnnotation = (RequestMapping) executeClass.getAnnotation(RequestMapping.class);
			if (classAnnotation != null) {
				String[] classValue = classAnnotation.value();
				//2.获取方法上的@RequestMapping(xxx)
				RequestMapping methodAnnotation = method.getAnnotation(RequestMapping.class);
				if (methodAnnotation != null) {
					String[] methodValue = methodAnnotation.value();
					url = classValue[0] + methodValue[0];

					//获取访问的ip
					String ip = request.getRemoteAddr();

					//获取当前操作的用户
					SecurityContext context = SecurityContextHolder.getContext();//从上下文中获了当前登录的用户
					User user = (User) context.getAuthentication().getPrincipal();
					String username = user.getUsername();

					//将日志相关信息封装到SysLog对象
					SysLog sysLog = new SysLog();
					sysLog.setExecutionTime(time); //执行时长
					sysLog.setIp(ip);
					sysLog.setMethod("[类名] " + executeClass.getName() + "[方法名] " + method.getName());
					sysLog.setUrl(url);
					sysLog.setUsername(username);
					sysLog.setVisitTime(visitTime);

					//调用Service完成操作
					sysLogService.save(sysLog);
				}
			}
		}

	}
}
